Car Makers United ("CMU") is a large union whose members consist of workers who put automobiles together. The CMU is the official labor union of workers who work at Chevrolet's factory in Michigan. After a large recall in Chevrolet vehicles, Chevrolet decides that they will not give their workers a yearly raise and they will raise their monthly premiums for healthcare. The enraged employees strike for better wages and healthcare. During the strike, Chevrolet hires workers to come in and replace the striking workers. Chevrolet hires exactly as many workers as those who were striking so they can keep production constant. After two months of striking, Chevrolet and CMU come to an agreement about wages and healthcare premiums which ends the strike. CMU tells Chevrolet that they must fire the "scabs" who were hired during the strike so their union members can have their jobs back. Chevrolet says that they aren't going to fire anyone and they don't have to. Who is right and why